Broaching

Broaching

Broaching - Broaching is a process of machining a surface with a special tool called a Broach. A broach is a tapered bar into which teeth have been cut to as for produce a desired contour in a workpiece by a single pass or stroke of the broach.

The broach has three types of teeth namely Roughing teeth, Semi-finishing teeth, Finishing teeth. The broach is pushed or pulled through a hole or over a surface to remove metal by axial cutting.

Because broaches are multi toothed cutters produced to close tolerances, they are expensive; consequently, the process usually is employed only for high production.

Broaching is a modern method of metal removal that has almost unlimited applications in metal working. It can also be used as a method to work, Wood Graphite, Hard vulcanized fibre and some plastics. Metals and alloys are the most commonly broached materials, however.

Broaching can be used for several internal of external surfaces. The components include those requiring key ways, round holes and splined holes, together with flat surfaces. Unlike shapers and planers, broaching machines normally complete the cutting operation in one stroke of the tool.

Broaching can machine at a high rate of production and an accuracy and finish of ±0.013 mm and 0.8 to 3.0 µm. Both ferrous and nonferrous materials with hardness up to Rockwell C 40 can be broached.